The Kigali Amendment to the Montreal Protocol is an international agreement to gradually reduce the consumption and production of hydrofluorocarbons (HFCs).

[9] Originally, chlorofluorocarbons (CFCs) were used in these applications, but the deleterious effect of these gases on the ozone layer was revealed in 1974 by Paul J. Crutzen, Mario Molina, and F. Sherwood Rowland.

[12] While their lifespan in the atmosphere is short (10 to 20 years) relative to carbon dioxide (CO2), HFCs filter infrared waves much more powerfully.

[15] Article 5 of the Montreal Protocol created separate standards for developing countries and non-developing.

[16] Whether a country was categorized as developing or non-developing depended on individual economic conditions at the time of the agreement or pending special request.